diff --git a/.github/workflows/claude.yml b/.github/workflows/claude.yml
index bc77307..46f8aed 100644
--- a/.github/workflows/claude.yml
+++ b/.github/workflows/claude.yml
@@ -40,8 +40,9 @@ jobs:
           additional_permissions: |
             actions: read
           
-          # Optional: Specify model (defaults to Claude Sonnet 4, uncomment for Claude Opus 4.1)
-          # model: "claude-opus-4-1-20250805"
+          # Pin the model explicitly: the action's built-in default model has been
+          # retired and now returns a 404 not_found_error.
+          model: "claude-opus-4-8"
           
           # Optional: Customize the trigger phrase (default: @claude)
           # trigger_phrase: "/claude"